.header{
  position: sticky;
  top: 0;
  z-index: 99;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 50px;
  padding: 0 2vw;
  background-color: $theme;
  .avator{
    width: 32px;
    height: 32px;
    border-radius: 100%;
    background-color: #fff;
    @media (min-width: 640px) {
      width: 46px;
      height: 46px;
    }
  }
  .search{
    width: 50px;
    height: 50px;
    text-align: center;
    line-height: 50px;
    color: #fff;
  }
}